Mbuil-bonnaud



UNITED firnrns PATENT @rrrsn.

JEAN BAPTISTE GERMEUlL-BONNAUD, OF LONGTON, COUNTY OF STAFFORD, ENGLAND.

PROCESS OF PRODUCING COPIES FOR LITHOGFAPHY FROM PHOTOGRAPHS-SPECIPIC'ATION forming part of Letters Patent No. 358,774, dated March1, 18187.

Application filed January 15, 1887. Serial No.224AEI3.

(No specimens.) Patented in France August 28,1885, No. 170,889; in England November 9, 1885, No. 13,609, and in Germany November 125, 1885,No. 35,434.

To all whom it may concern.- I

Be it known that I, JEAN Brr'rrs'rn Gna MEUIL-BONNAUD, of Longton,Staffordshire, England, have invented a certain new and usefulImprovement in the Process of Producing Copies for Lithography fromPhotographs and other Designs, (which improvement has been patented inGreat Britain by Letters Patent No. 13,609, dated November 9, 1885; inFrance by Letters Patent No. 170,889, dated August 28, 1885, and inGermany by Letters Patent No. 35,43at, dated November 13, 1885,) ofwhich the following specification is a full, clear, and exactdescription.

This invention relates to a process for pro ducing on lithographicstones or plates copies from photographs or other designs suited forlithographic printing; and it consists,mainly, in the production of anartificial grain on the photograph or drawing, enabling impressions tobe taken froma smooth stone or plate either on paper, porcelain, orother materials. For this purpose a photograph or other design iscovered with a coating, transparent or semitransparent, composedasfollows: About fifty parts, by weight, of starclrflour are dissolvedin one hundred parts of water at about 70 centigrade, to which are addedabout twenty parts of gum-arabic and twenty parts of sugar. Thiscompound is intimately mixed while heated on a water bath until itbecomes a homogeneous mass, and to this is then added about thirty partsof kaolin. When the whole has been formed into a paste of a somewhatliquid nature, it is ground down by means of a glass muller until it hasattained the requisite degree of fineness. This compound is thencarefully spread upon the photographic or other design, taking care toavoid all lumps or unevennesses, and this is allowed to dry whilestretched on a board by means of drawing-pins. Vhen the drawing is dry,the outline is traced upon it by means of a pen and dilute lithographicink, and the half-tints are putin by means of alithographic crayon,copying as nearly as possible the shadings of the original, which may bereadily done without requiring any great skill or any special knowledgeof lithography.

the paper is slightly moistened, and is then applied to the stone orzinc plate, which is also slightly moistened and heated in the firstinstance. After pressure has been repeatedl y applied, boiling water ispoured over the paper, which is then removed, leaving the design uponthe stone or plate. This is now left for about five or six hours, afterwhich it is inked and impressions taken in the usual manner. By thesemeans an outline drawing or engraving can also be converted into ashaded lithograph.

Instead of imparting the necessary grain to the compound by which thedesign is transmitted to the stone, a paste or coating of the followingcomposition is spread on. the photograph: water, one hundred partsstarch, forty parts; gum, twenty parts 5 sugar, ten parts, the wholebeing boiled. The photograph or drawing, tolerably thickly coated withthis compound, is allowed to dry, and after slightly moistening it ispressed on a lithographic stone or plate on which the necessary grainhas been produced, so that this grain is impressed upon the surface ofthe coating. The design is then drawn upon this grained coating, and isthen transferred to the stone in the same way as above described.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim isa 1. The method herein described of producing a copy of aphotograph or drawing upon a lithographic stone or plate by firstforming on the photograph or drawing a coating havinga grain producedartificially thereon, then tracing upon the said coatingwithlithographic ink a copy of the photograph or design, and, lastly,transferring such design to a smooth stone or plate, substantiallyasdescribed.

2. In the process of transferring a photograph or drawing onto alithographic stone or plate, the improvement consisting in producing agrained surface upon the photograph or drawing by the applicationthereto of a compound containing kaolin, substantially as and for thepurposes herein described.

3. In the process of transferring a photograph or drawing onto alithographic stone or plate, the improvement consisting in producing agrained surface upon the photograph or drawing by applying thereto acoating, which is then pressed upon a grained stone or plate, so as tohave the grain thereof imparted to it, substantially as described.

4. The method herein described of transferring to a lithographic stoneor plate a design produced by drawing with lithographic ink on aphotograph or drawing coated with a gelatinous composition,by moisteningthe photograph or drawing, and also moistening and I heating the stoneor plate, then applying the 20 former to the latter under pressure, and,after pouring boiling water on the photograph or drawing, removing thesame, leaving the de sign on the stone or plate, substantially asdescribed. In witness whereof I have hereunto signed my-nanie in thepresence of two subscribing witnesses.

JEAN BAPTISTE GERillEUlL-BONNAUI). \Vitnesses:

GEORGE EDWARD WALKER, AUG. SPICAUD.

